package com.smart.tools;
import java.io.UnsupportedEncodingException;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;  
  
public class Base64 {  
   
	/**
	 * 
	 * @Title: encode 
	 * @Description: 加密
	 * @author tangyan 
	 * @param str
	 * @return
	 */
    public static String encode(String str) {  
        byte[] b = null;  
        String s = null;  
        try {  
            b = str.getBytes("utf-8");  
        } catch (UnsupportedEncodingException e) {  
            e.printStackTrace();  
        }  
        if (b != null) {  
            s = new BASE64Encoder().encode(b);  
            //据RFC 822规定，每76个字符，还需要加上一个回车换行去掉换行符  
            s = s.replaceAll("[\\s*\t\n\r]", "");    
        }  
        return s;  
    }  
  
    /**
     * 
     * @Title: decode 
     * @Description: 解密
     * @author tangyan 
     * @param s
     * @return
     */
    public static String decode(String s) {  
        byte[] b = null;  
        String result = null;  
        if (s != null) {  
            BASE64Decoder decoder = new BASE64Decoder();  
            try {  
                b = decoder.decodeBuffer(s);  
                result = new String(b, "utf-8");  
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
        }  
        return result;  
    }  
    public static void main(String[] args){  
      
        String deStr = decode("5L2g5aW9IFRoZSBXb3JkIQ==");  
        System.out.println(deStr);
    }  
}   